| 摘要 |
A suitable method for starting a SOFC system of the present invention leads to improve durability. By combusting the fuel gas supplied from the reformer to the combustion portion in S11 during system start-up, the temperatures of the reformer and the fuel cell stack are increased from room temperature. In S11, an ATR process begins, and the hydrogen-enriched fuel gas is generated by the autothermal reforming reaction. In S12, a cell temperature T is compared to a minimum reduction start temperature T1 of the cell support and, in the case of T ‰¥ (greater than or equal to) T1, the process proceeds to S13. In S13, by setting a mixed molar ratio (O 2 /C) of oxygen in the ATR air supplied to the reformer and hydrocarbon in the raw fuel to 0.3 or more, the hydrogen concentration of the fuel gas is set to 50% or less. In S14, the cell temperature T is compared to a maximum reduction start temperature T2 of the cell support, and in the case of T > (greater than) T2, the process proceeds to step S15. In S15, the temperatures of the reformer and the fuel cell stack are continuously raised, while gradually increasing the hydrogen concentration of the fuel gas by decreasing O 2 /C. |
